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TY - CONF AU - Pezzetti, M. AU - Arpaia, P. AU - Girone, M. AU - Hubatka, M. ED - Corvetti, Lou ED - Riches, Kathleen ED - Schaa, Volker RW TI - Active Magnetic Bearings System Upgrade for LHC Cryogenic Cold Compressor, Radiations Mitigation Project (R2E) J2 - Proc. of ICALEPCS2015, Melbourne, Australia, 17-23 October 2015 C1 - Melbourne, Australia T2 - International Conference on Accelerator and Large Experimental Physics Control Systems T3 - 15 LA - english AB - During the normal operation of the Large Hadron Collider, the high hadron flux level induced several Single Event Errors (SEE failure caused by a particle passing through) to the standard electronics installed. Such events perturbed LHC normal operation. As a consequence, a mitigation plan to minimise radiation-induced failures and optimise LHC operation was started: R2E mitigation project. This paper will deal with the mitigation problem for LHC/P8 equipment and the main improvements for the equipment in P4, with special focus on the controllers for the Active Magnetic Bearings used in the IHI-LINDE cold compressors. In addition, a new approach based on frequency response analysis to assess the cold compressor mechanical quality will be presented. The hardware and software design, implemented to increase the global reliability of the system, will be highlighted. A corresponding experiment protocol was developed at CERN in collaboration with the MECOS Company and the Universities of Sannio and Napoli Federico II. Preliminary experimental results showing the performance of the proposed approach on a case study for the cold compressor in P4 will be finally reported. PB - JACoW CP - Geneva, Switzerland SP - 480 EP - 484 KW - controls KW - radiation KW - operation KW - software KW - hardware DA - 2015/12 PY - 2015 SN - 978-3-95450-148-9 DO - 10.18429/JACoW-ICALEPCS2015-MOPGF171 UR - http://jacow.org/icalepcs2015/papers/mopgf171.pdf ER -